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  • C#编写数据库 SqlHelper

    static class SqlHelper
    {
    public static readonly string connstr = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;

    public static int ExecuteNonQuery(string sql,
    params SqlParameter[] parameters)
    {
    using (SqlConnection conn = new SqlConnection(connstr))
    {
    conn.Open();
    using (SqlCommand cmd = conn.CreateCommand())
    {
    cmd.CommandText = sql;
    cmd.Parameters.AddRange(parameters);
    return cmd.ExecuteNonQuery();
    }
    }
    }

    public static object ExecuteScalar(string sql,
    params SqlParameter[] parameters)
    {
    using (SqlConnection conn = new SqlConnection(connstr))
    {
    conn.Open();
    using (SqlCommand cmd = conn.CreateCommand())
    {
    cmd.CommandText = sql;
    cmd.Parameters.AddRange(parameters);
    return cmd.ExecuteScalar();
    }
    }
    }

    public static DataTable ExecuteDataTable(string sql,
    params SqlParameter[] parameters)
    {
    using (SqlConnection conn = new SqlConnection(connstr))
    {
    conn.Open();
    using (SqlCommand cmd = conn.CreateCommand())
    {
    cmd.CommandText = sql;
    cmd.Parameters.AddRange(parameters);

    DataSet dataset = new DataSet();
    SqlDataAdapter adapter = new SqlDataAdapter(cmd);
    adapter.Fill(dataset);
    return dataset.Tables[0];
    }
    }
    }

    public static object FromDbValue(object value)
    {
    if (value == DBNull.Value)
    {
    return null;
    }
    else
    {
    return value;
    }
    }

    public static object ToDbValue(object value)
    {
    if (value == null)
    {
    return DBNull.Value;
    }
    else
    {
    return value;
    }
    }
    }

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  • 原文地址:https://www.cnblogs.com/zhangshan/p/4132262.html
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